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Below you can find a lot of useful software split into the following sections:
Audio Tools: All you need to process audio. From AC3 extraction, over AC3 decoder to mp3 compressors and synchronizing tools
Avi Editing Tools: Everything you need to edit AIVIs, cut, join, add audio tracks, etc.
Calculators: Calculation programs that will calculate almost anything for you
Codecs: All you need to play back MPEG-4 movies.
Descrambling / Ripping tools: All the good DVD Ripping programs to get your VOBs from the DVD disc to your harddisk
Decoders: Programs that can decode a DVD stream (encoders then encode that data to MPEG-1/2/4).
Digital TV: All the tools you need to process captured digital TV content (DVB, HDTV)
DivX / MPEG-4 encoders: programs that will encode DVDs to DivX and other MPEG-4 formats
Filters: various filters to play DVDs, AC3 audio and filters for VirtualDub and Avisynth
Launchers: Autorun programs to play your AVIs upon insertion of the CD.
Media Players: Media Player replacements and a Hollywood Plus player.
MPEG1/2 Encoders: programs that encode your DVDs to MPEG-1/2
Region free Tools: 2 tools to make your Hollywood Plus & Software DVD Player region free
Source codes: source codes for all the open source tools you can find on this page
Subtitles: All tools needed to extract and process subtitles. Including various subtitle format converters
Support Utils: useful goodies for all kinds of stuff
S/VCD Tools: tools to convert, edit and burn VCD and SVCDs
VOB Tools: stream extractors, merger and splitter. Complements to the Rippers